Metallic alloy.



'30 course, be understood 'tha Unrrnn STATESPATENT onrron FRANK S. HO DSON, F. PHILADELPHIA, PENNSYLVANIA.

METALLIC AILLoY.

No Drawing.

To all whom it may concern:

Be it known that I, FRANK' S. HODSON, a

citizen of the United States, residing at' of Philadelphia Philadelphia, in the county have invented and State of Pennsylvania,

certain new and useful Improvements m metallic alloy. One object of my invention is to provide an improved metallic alloy of high tensile strength and hardness and which is particularly suitable for use in the manufacture of high etc.

According to my invention, metallic alloy is composed of zinc, num and copper.

In carrying out my invention, the quantities of the metals forming my improved alloy may vary preferably in the following relative proportions:-

Zinc 80% to85% Aluminum 18% to 14% the remaining percentage being completed with copper. v

In specifying, these metals it will, of

t I contemplate employing them as commercially furnished,

my improved alumithat therefore the usual variations in the purity of each are ignored. For instance, in commercial zinc there is not in 85 frequently present as high as fiveper cent.

of lead. Such normal commercial impurities do not, however, injuriousl affect the character of the resultant pr not in my experience, and their presence may be toler- 40 ated without departure from my invention.

' In manufacturing the alloy I prefer to proceed as follows: The copper is first melted and the aluminum is then added thereto, thus forming what may be termed a mothertensile strength die 15' castings, drawn rods and bars, and sheets,

I Specification of Letters Patent. Patented Aug. 27, 1918 Application filed August 2 8, 1917. Serial No. 188,555.

' alloy, to which the zinc is added. The zinc may be added either to the aluminum copper alloy in its initial condition of melting or the mother-alloy may be first prepared and re-melted for addition of the proper proportion of zinc. As a definite example of proportions with the several ingredients in a condition of relatively high purity I would state that the mother-alloy may be composed of eight per cent. of copper and ninety-two per cent. of aluminum, and the ultimate alloy may consist of eighteen per cent. of this mother-alloy, and eighty-two per cent. of zinc.

In carrying out tests with the alloy it has been found that in sand castings the tensile strength of the alloy approximates to 36,000 pounds to the square inch, and that under the Brinnel test'the alloy shows va hardness of 35.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The herein described composition of matter, consisting ofv an alloy of copper, aluminum and zinc, the aluminum being present' in large excess of the copper and the zinc being present in large excess of the aggregateamount of aluminum and copper together, substantially as described.

2. The herein described composition of matter consisting of a metallic alloy in the following proportions, zinc eighty to eightyfive parts, aluminum eighteen to fourteen parts, and copper two to one parts, substantially as described.

In testimony whereof I have signed my name to this specification in the presence OHA's. E. Po'r'rs 'MARY A. INGLAR. 

